What is the purpose of the Synch Bus?

• A. It powers all the electrical systems of the aircraft.
• B. It powers only the cockpit instruments.
• C. It powers only the cabin lights.
• D. It powers hydraulic systems.

Answer: (A)

The Synch Bus acts as the main electrical distribution path for the aircraft, providing a shared power feed to most of the airplane’s electrical equipment. When power is available, this bus distributes it to the avionics, flight instruments, displays, controls, and lighting, helping everything operate in a coordinated, synchronized way. It isn’t limited to just cockpit instruments or only cabin lights, and hydraulic systems aren’t the primary purpose of this bus (hydraulics are typically driven by separate pumps and sources). So powering all electrical systems is the best description of its role.